Joseph benesh



(No Model.)

J. BBNESH.

GRAIN SCREEN.

No. 506,657. Patented Oct. 1'7, 1893.

UNITED STATES PATENT- OFFICE.

JOSEPH BENESH, RACINE, WISCONSIN, ASSIGNOR OF ONE-HALF TO W. G. ADAMS,OF SAME PLACE.

GRAIN-SCREEN.

SPEOIFIGATION forming part of Letters Patent No. 506,657, dated October17, 1893.

Application filed September 27,1892. Serial No. 447,088- (No model.)

To all whom it may concern:

Be it known that I, J OSEPH BENESH, a citizen of the United States,residing at Racine, in the county of Racine and State of Wisconsin, haveinvented a certain new and useful Improvement in Grain-Screens, w hichis fully set forth in the following specification, reference being hadto the accompanying drawings, in which Figure 1 represents a plan viewof a screen embodying my invention; Fig. 2, a section of the same takenon theline 22, Fig. l; and Fig. 3, a similar section taken on the line33, Fig. 1. u

My invention relates to screens for use in grain separating machines,and especially to that type of screen in which the surface is composedof ribbed metal, or separate ribs of metal, with slots, or openings,between the ribs. In screens of this type, as heretofore constructed,the slots at each end are closed by the straight sides of the frame,making a substantially, straight, vertical stop at the ends of theslots, and extending the depth thereof; these stops obstruct the freepassage of the grains, or seeds, off from the screen and result in thebacking up of the grains, thus filling, or covering, the slots and sopreventing the screenings from dropping down between the ribs.

It is the object of my present invention to overcome this defect, and toaccomplish it, I bring the edges of the ribs gradually together at theends of the slots. at the lower end of the screen, and preferably, givea slight inclination to the metal upward, at these points, so as toprovide short inclined ways, up and over which the grains, or seeds,readilypass off from the screen.

In constructing the screen, the metal surface, or covering, may beeither one sheet of metal properly corrugated and slotted or the ribsmay be formed of separate pieces fastened separately to the frame.

In the drawings, I have shown a construction with a metal sheet, which Iwill now describe. In these drawings, A, represents a screen frame whichmay be of wood or any other suitable material; it is rectangular in formand composed of the side bars, a, and end bars, a. A sheet, B, of tin,galvanized iron, or any other suitable material, is cut in form and sizeto correspond with this frame, so as to be properly fitted thereto; thissheet is corrugated and slotted so as to provide alternate ribs, 17, andintervening spaces, or slots, b, as shown in the drawings. The ribs areof triangular form with the ridges uppermost, though they may be of anyother form, if desired. At the lower end of the screen, the edges of theribs on each side of the slots are gradually drawn together and inclinedoutward slightly, so as to form at this end of each slot a shortinclined way, 6 extending from the bottom of the slot upward and outwardto the level edge, 0, of the screen. In the well known operation ofscreening, or sepa rating, machines, the grains, or seeds, pass alongdown the screen, and are delivered over the lower edge thereof. Wherethere are abrup't stops, or shoulders, at these lower ends of the slots,some of the grains are stopped, and gradually back up and fill theslots; but. when constructed as described above and shown in thedrawings, there is no stoppage of grains at these lower ends of theslots, but they slip readily over the inclined ways, and all danger ofbacking up and obstructing the screen is entirely obviated.

As already stated, the ribs, or bars, of the screen may be formedseparately and attached to the frame in the usual way, but in thisinstance they must be shaped so. that when placed alongside each otheron the frame, as required, the edges of the ribs at the lower, ordischarge end of. the screen will be brought together on converginglines.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A grain screen consisting of alternate ribs and slots, the formerconstructed with converging edges at the discharge end of the screen,whereby the slots are tapered and closed, substantially as described. v

2. A grain screen consisting of ribs, B, intermediate slots, 1) andinclined ways, W, at the discharge ends of the slots, substantially asdescribed.

JOSEPH BENESII.

Witnesses:

E; B. KILBOURN, ED. W. RAPrs.

